Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 120/12 = 10 km/hr Or, 25 – y = 10 Or, y = 25 – 10 = 15 km/hr Therefore, downstream speed of the boat = 25 + 15 = 40 km/hr Required time taken = 160/40 = 4 hours
The average monthly contribution of 25 members in a project is Rs. 8,400. Following a fee increase, the new monthly average contribution per member is R...
Average of 20 numbers is 90. Average of first 8 numbers is 92 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numbe...
The average weight of a group of 15 students increases by 1.5 kg when the weight of the teacher is also included. If earlier the average weight of the g...
The average marks of all the students decreased by 2 when it was found that marks of one of the student were wrongly interpreted as 80 instead of 40. Fi...
The average weight of 25 employees in an office increases by 0.8 kg when the weight of the manager is included. If earlier the average weight of the emp...
The average of two numbers is 25, and the square root of their product is 20. What is the difference between the two numbers?
There are 15 numbers such that average of first 12 numbers is 60 while the average of last five numbers is 75. Find the 12th number, if the ratio betwee...
X and Y have weights of 36 kg and 60 kg, respectively. Z weighs 12 kg less than X. Calculate the average weight of X, Y, and Z.
The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg andthat of B and C be 43 kg, then the weight of B is :
The average monthly fee of all 45 students in a class is Rs. 9,500. After an increment, the new monthly average fee of each student becomes Rs. (9500 + ...
